Hi Doug, thanks for your comments, and congratulations on the new printer. I've seen a lot of output now and am impressed with the HPs. During a gathering at PMA, my friend Amadou Diallo managed to connect the top level people from both HP and Ergosoft, so perhaps there will be some kind of mutual effort there soon.
More to the point- while testing the new (and VERY impressive, and expensive) photo papers from Innova, and working on some files from a mutual friend of ours, I came up against differential problems yet again. These papers looked problem free until these files. Turns out there are certain ink combinations that are problematic, certain colors, light inks, dot sizes, GCR, etc..
Needless to say I've nearly gone broke through paper and ink trying to nail this down and it's gotten very interesting.
I think I've nearly got it solved in the shadows, and deep colors to K transitions. This is for Ultrachrome K3s of course, that's what I have to work with.
Highlights to paper base transitions are another thing, I think it's a paper issue myself. Anyway, this has been very interesting, and maddening of course, but I've been amazed to find there are ways to make things better.